/* ============================================================
   VibeSpin 多页官网 · 站点层样式
   依赖 assets/vibespin.css 的 Token / 按钮 / 终端组件。
   ============================================================ */

html { scroll-behavior: smooth; }
body { background: var(--bg-base); }
::selection { background: var(--accent-line); color: #fff; }

/* 小字号强调色：在卡片上保持 4.5:1 以上 */
:root { --accent-text: #38D6FF; }
.eyebrow__chip { color: var(--accent-text); }

/* 跳转链接 */
.skip {
  position: fixed; left: 16px; top: -60px; z-index: 200;
  background: var(--accent-fill); color: var(--accent-fg); padding: 10px 16px;
  border-radius: var(--r-sm); font-size: 13px; font-weight: 600;
  transition: top var(--dur-1) var(--ease);
}
.skip:focus { top: 12px; }
section[id] { scroll-margin-top: 88px; }

/* ---------- 顶栏 ---------- */
.site-header {
  position: sticky; top: 0; z-index: 80;
  background: color-mix(in oklch, var(--bg-base) 90%, transparent);
  backdrop-filter: blur(18px) saturate(1.3);
  border-bottom: 1px solid var(--border-faint);
}
.site-nav { height: 68px; display: flex; align-items: center; gap: 20px; }
.site-nav .logo { flex: none; }
.logo__domain {
  padding-left: 10px; margin-left: 2px; border-left: 1px solid var(--border);
  font-family: var(--font-mono); font-size: 10.5px; letter-spacing: .06em;
  color: var(--muted); white-space: nowrap;
}
.site-nav__links { margin-left: auto; display: flex; align-items: center; gap: 2px; }
.site-nav__links a {
  padding: 8px 11px; border-radius: 8px; font-size: 13.5px;
  color: var(--fg-secondary); white-space: nowrap;
  transition: background var(--dur-1) var(--ease), color var(--dur-1) var(--ease);
}
.site-nav__links a:hover { color: var(--fg); background: rgba(255,255,255,.05); }
.site-nav__links a[aria-current="page"] { color: var(--fg); background: var(--accent-soft); }
.site-actions { display: flex; align-items: center; gap: 6px; flex: none; }
.site-cta { min-height: 44px; }

/* details 菜单 */
details summary { list-style: none; cursor: pointer; }
details summary::-webkit-details-marker { display: none; }
.lang { position: relative; }
.lang > summary {
  height: 44px; min-width: 72px; display: inline-flex; align-items: center; justify-content: center;
  gap: 6px; padding: 0 9px; border-radius: var(--r-sm); color: var(--fg-secondary);
  font-size: 11.5px; font-weight: 550; border: 1px solid transparent;
  transition: background var(--dur-1) var(--ease), color var(--dur-1) var(--ease), border-color var(--dur-1) var(--ease);
}
.lang > summary:hover, .lang[open] > summary { color: var(--fg); background: rgba(255,255,255,.06); border-color: var(--border); }
.lang > summary:focus-visible, .mmenu > summary:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
.lang__short { white-space: nowrap; }
.lang__panel, .mmenu__panel {
  position: absolute; top: calc(100% + 8px); right: 0; z-index: 90;
  background: var(--bg-elevated); border: 1px solid var(--border);
  border-radius: var(--r-md); box-shadow: var(--shadow-pop);
  max-height: calc(100vh - 96px); overflow-y: auto;
}
.lang__panel { width: 224px; padding: 6px; }
.lang__panel a {
  display: flex; align-items: center; justify-content: space-between; gap: 12px;
  min-height: 44px; padding: 0 10px; border-radius: var(--r-xs);
  color: var(--fg-secondary); font-size: 13.5px;
}
.lang__panel a:hover { background: rgba(255,255,255,.06); color: var(--fg); }
.lang__panel a[aria-current="true"] { background: var(--accent-soft); color: var(--fg); }
.lang__panel .mono { font-size: 10px; color: var(--fg-secondary); letter-spacing: .04em; }

.mmenu { display: none; position: relative; }
.mmenu > summary {
  width: 44px; height: 44px; display: inline-flex; align-items: center; justify-content: center;
  border-radius: var(--r-sm); color: var(--fg-secondary); border: 1px solid transparent;
}
.mmenu > summary:hover, .mmenu[open] > summary { color: var(--fg); background: rgba(255,255,255,.06); border-color: var(--border); }
.mmenu__panel { width: min(300px, calc(100vw - 32px)); padding: 8px; }
.mmenu__panel > a {
  display: flex; align-items: center; min-height: 44px; padding: 0 12px; border-radius: var(--r-xs);
  color: var(--fg-secondary); font-size: 14px;
}
.mmenu__panel > a:hover { color: var(--fg); background: rgba(255,255,255,.06); }
.mmenu__panel > a[aria-current="page"] { color: var(--fg); background: var(--accent-soft); }
.mmenu__panel > .btn { margin-top: 8px; width: 100%; }

/* ---------- 页脚 ---------- */
.site-footer { border-top: 1px solid var(--border); background: var(--bg-recessed); padding: 56px 0 28px; margin-top: 0; }
.footer-grid { display: grid; grid-template-columns: 1.7fr repeat(3, 1fr); gap: 40px; }
.footer-brand .logo { margin-bottom: 14px; }
.footer-brand .small { max-width: 32ch; }
.footer-domain { display: inline-block; margin-top: 10px; font-size: 12px; color: var(--muted); }
.footer-col { display: flex; flex-direction: column; gap: 8px; }
.footer-col .label { margin-bottom: 4px; color: var(--fg-secondary); }
.footer-col a { font-size: 13.5px; color: var(--muted); }
.footer-col a:hover { color: var(--fg); }
.footer-bottom {
  display: flex; flex-wrap: wrap; align-items: center; gap: 10px 24px;
  margin-top: 40px; padding-top: 20px; border-top: 1px solid var(--border-faint);
}
.footer-bottom .caption { margin: 0; }
.footer-lang { display: flex; flex-wrap: wrap; gap: 6px 14px; margin-left: auto; }
.footer-lang a { font-size: 12px; color: var(--muted); }
.footer-lang a:hover { color: var(--fg); }
.footer-lang a[aria-current="true"] { color: var(--fg); }

/* ---------- 首页 Hero ---------- */
.hero { padding: 76px 0 64px; position: relative; overflow: hidden; }
.hero::before {
  content: ""; position: absolute; inset: 0; pointer-events: none;
  background: radial-gradient(720px 420px at 72% -12%, color-mix(in oklch, var(--accent) 16%, transparent), transparent 70%);
}
.hero__grid { display: grid; grid-template-columns: 1.2fr .8fr; gap: 48px; align-items: center; position: relative; }
.hero__copy { min-width: 0; }
.hero h1 { max-width: none; font-size: clamp(34px, 4.2vw, 56px); text-wrap: balance; }
.hero .lead { max-width: 48ch; margin-top: 20px; }
.hero__actions { display: flex; gap: 12px; flex-wrap: wrap; margin-top: 28px; }
.hero__badges { display: flex; gap: 8px; flex-wrap: wrap; margin-top: 22px; }
.hero__visual { min-width: 0; display: flex; justify-content: center; }

.demo {
  width: 100%; max-width: 520px; background: var(--bg-card);
  border: 1px solid var(--border); border-radius: 18px;
  overflow: hidden; box-shadow: var(--shadow-3);
}
.demo__bar { height: 40px; display: flex; align-items: center; gap: 10px; padding: 0 14px; border-bottom: 1px solid var(--border-faint); }
.demo__bar .capsule { margin-left: auto; }
.demo__body { padding: 14px; display: flex; flex-direction: column; gap: 10px; }
.demo__approval { background: var(--bg-elevated); border: 1px solid var(--border); border-radius: 12px; padding: 12px; display: flex; flex-direction: column; gap: 10px; }
.demo__approval .row:last-child { justify-content: flex-end; }
.demo .term { border-radius: 12px; background: var(--bg-terminal); padding: 12px 14px; min-height: 220px; font-size: 12.5px; overflow: auto; }
.demo .term__line { line-height: 1.7; }

/* ---------- 通用区块 ---------- */
.sec { padding: 56px 0; }
.sec + .sec { border-top: 1px solid var(--border-faint); }
.sec__head { display: flex; flex-direction: column; gap: 6px; margin-bottom: 22px; }
.sec__index { font-family: var(--font-mono); font-size: 11px; letter-spacing: .1em; color: var(--accent); }
.sec h2 { font-size: clamp(24px, 3vw, 34px); line-height: 1.3; letter-spacing: 0; text-wrap: balance; }
.sec__intro { max-width: 68ch; color: var(--muted); font-size: 15px; line-height: 1.7; margin-bottom: 24px; }
.sec__more { margin-top: 18px; }
.text-link { display: inline-flex; align-items: center; gap: 6px; font-size: 13.5px; color: var(--fg-secondary); }
.text-link:hover { color: var(--fg); }
.text-link svg { color: var(--accent); }

.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 16px; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; }

/* 定义 + 事实 */
.definition { display: grid; grid-template-columns: minmax(0, 1fr) 340px; gap: 48px; align-items: start; }
.definition h2 { font-size: clamp(26px, 3.4vw, 38px); margin: 10px 0 14px; line-height: 1.3; }
.definition .lead { font-size: 18px; color: var(--fg-secondary); }
.facts-card { background: var(--bg-card); border: 1px solid var(--border); border-radius: 16px; padding: 24px; }
.facts-card .label { color: var(--fg-secondary); margin-bottom: 14px; }
.facts-card ul { display: flex; flex-direction: column; gap: 10px; }
.facts-card li { display: flex; gap: 10px; align-items: flex-start; font-size: 13.5px; color: var(--fg-secondary); line-height: 1.5; }
.check { color: var(--direct); font-weight: 700; }
.dash { color: var(--faint); }

/* 地图卡 */
.map-grid { gap: 16px; }
.map-card {
  display: flex; flex-direction: column; gap: 10px; min-height: 178px; padding: 24px;
  background: var(--bg-card); border: 1px solid var(--border-faint); border-radius: 16px;
  transition: background var(--dur-2) var(--ease), border-color var(--dur-2) var(--ease), transform var(--dur-2) var(--ease);
}
.map-card:hover { background: var(--bg-elevated); border-color: var(--border-strong); transform: translateY(-2px); }
.map-card__index { font-family: var(--font-mono); font-size: 11px; letter-spacing: .08em; color: var(--accent-text); }
.map-card h3 { font-size: 20px; margin-top: 2px; }
.map-card p { flex: 1; color: var(--muted); font-size: 13.5px; line-height: 1.6; }
.map-card__more { display: inline-flex; align-items: center; gap: 6px; font-size: 12.5px; color: var(--fg-secondary); }
.map-card__more svg { color: var(--accent); }

/* 功能 / 场景 / 安全卡 */
.feature { padding: 24px; display: flex; flex-direction: column; gap: 14px; }
.feature__ico {
  width: 42px; height: 42px; border-radius: 11px; display: flex; align-items: center; justify-content: center;
  background: var(--accent-soft); border: 1px solid var(--accent-line); color: var(--accent); flex: none;
}
.feature h3 { font-size: 16px; line-height: 1.35; }
.feature p { font-size: 13.5px; color: var(--muted); line-height: 1.65; }
.scenario { padding: 22px; display: flex; flex-direction: column; gap: 12px; }
.scenario__no { font-family: var(--font-mono); font-size: 11px; letter-spacing: .08em; color: var(--accent-text); }
.scenario__arrow { color: var(--muted); }
.scenario h3 { font-size: 17px; }
.scenario p { color: var(--muted); font-size: 13.5px; line-height: 1.65; }

/* 套餐 */
.plans { align-items: stretch; grid-template-columns: repeat(2, 1fr); }
@media (min-width: 1200px) { .plans { grid-template-columns: repeat(4, 1fr); } }
@media (max-width: 680px) { .plans { grid-template-columns: 1fr; } }
.plan {
  display: flex; flex-direction: column; gap: 10px; padding: 22px;
  background: var(--bg-card); border: 1px solid var(--border-faint); border-radius: 16px;
}
.plan--hl { border-color: var(--accent-line); background: linear-gradient(180deg, var(--accent-soft), var(--bg-card) 42%); }
.plan__head { display: flex; align-items: center; justify-content: space-between; gap: 10px; min-height: 24px; }
.plan__head h3 { font-size: 15px; }
.plan__amt { font-family: var(--font-display); font-size: 36px; font-weight: 600; letter-spacing: -.02em; margin-top: 4px; line-height: 1.1; }
.plan__amt span { font-family: var(--font-ui); font-size: 13px; font-weight: 500; color: var(--muted); letter-spacing: 0; }
.plan .caption { min-height: 18px; }
.plan__list { display: flex; flex-direction: column; gap: 9px; margin-top: 8px; flex: 1; }
.plan__list li { display: flex; gap: 9px; align-items: flex-start; font-size: 13px; color: var(--fg-secondary); line-height: 1.5; }
.plan .btn { margin-top: 14px; }

/* 步骤 */
.steps { display: flex; flex-direction: column; }
.steps li { display: flex; gap: 20px; padding: 22px 0; border-top: 1px solid var(--border-faint); }
.steps li:first-child { border-top: 0; padding-top: 0; }
.steps__n { flex: none; min-width: 76px; padding-top: 4px; font-family: var(--font-mono); font-size: 10.5px; letter-spacing: .08em; color: var(--accent); text-transform: uppercase; }
.steps h3 { font-size: 17px; margin-bottom: 6px; }
.steps p { font-size: 14px; color: var(--muted); line-height: 1.7; max-width: 70ch; }
.cmd { margin-top: 12px; background: var(--bg-terminal); border: 1px solid var(--border-faint); border-radius: 10px; padding: 12px 14px; overflow-x: auto; font-family: var(--font-mono); font-size: 12px; color: var(--fg-secondary); }
.cmd code { font-family: inherit; }
.pair-inline { display: flex; gap: 12px; align-items: center; flex-wrap: wrap; margin-top: 12px; }
.pair-inline .mono { font-size: 18px; letter-spacing: .08em; color: var(--accent); }
.capsules { display: flex; gap: 8px; flex-wrap: wrap; margin-top: 12px; }

/* 平台 */
.platform-list { border: 1px solid var(--border-faint); border-radius: 14px; overflow: hidden; background: var(--bg-card); }
.platform-row { display: flex; align-items: center; justify-content: space-between; gap: 20px; padding: 16px 18px; }
.platform-row + .platform-row { border-top: 1px solid var(--border-faint); }
.platform-row > div { min-width: 0; }
.platform-row__name { font-size: 14.5px; font-weight: 550; }
.platform-row__sub { font-size: 12.5px; color: var(--muted); margin-top: 3px; line-height: 1.5; }
.status { display: inline-flex; align-items: center; gap: 6px; flex: none; font-family: var(--font-mono); font-size: 11px; letter-spacing: .04em; white-space: nowrap; color: var(--muted); }
.status__dot { width: 6px; height: 6px; border-radius: 50%; background: var(--faint); }
.status--live { color: var(--direct); }
.status--live .status__dot { background: var(--direct); }
.status--planned { color: var(--muted); }
.status--planned .status__dot { background: var(--faint); }

/* 表格 */
.table-wrap { overflow-x: auto; border: 1px solid var(--border-faint); border-radius: 14px; }
.table-wrap:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
.compare { width: 100%; min-width: 620px; border-collapse: collapse; font-size: 13.5px; }
.compare th, .compare td { padding: 13px 16px; border-bottom: 1px solid var(--border-faint); text-align: left; }
.compare thead th { background: var(--bg-recessed); font-family: var(--font-mono); font-size: 10.5px; letter-spacing: .06em; text-transform: uppercase; color: var(--muted); }
.compare thead th:not(:first-child), .compare td:not(:first-child) { text-align: center; }
.compare tbody th { font-weight: 500; color: var(--fg-secondary); }
.compare tbody tr:last-child th, .compare tbody tr:last-child td { border-bottom: 0; }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0; }

/* FAQ */
.faq details { border-top: 1px solid var(--border-faint); padding: 18px 0; }
.faq details:last-child { border-bottom: 1px solid var(--border-faint); }
.faq summary { list-style: none; cursor: pointer; display: flex; justify-content: space-between; align-items: center; gap: 20px; font-size: 15px; font-weight: 550; line-height: 1.5; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "+"; flex: none; font-family: var(--font-mono); color: var(--muted); font-size: 18px; }
.faq details[open] summary::after { content: "−"; }
.faq__a { margin-top: 12px; color: var(--muted); font-size: 14px; line-height: 1.75; max-width: 72ch; }

/* 列表 / 提示 / 联系 */
.never-list { border: 1px solid var(--border-faint); border-radius: 14px; background: var(--bg-card); overflow: hidden; }
.never-list li { display: flex; gap: 12px; align-items: flex-start; padding: 16px 18px; font-size: 14px; color: var(--fg-secondary); line-height: 1.6; }
.never-list li + li { border-top: 1px solid var(--border-faint); }
.never-list__x { flex: none; color: var(--offline); margin-top: 1px; }
.callout { display: flex; justify-content: space-between; align-items: center; gap: 32px; flex-wrap: wrap; padding: 28px; margin-top: 24px; background: var(--bg-card); border: 1px solid var(--border-faint); border-radius: 16px; }
.callout h2 { font-size: clamp(20px, 2.4vw, 27px); line-height: 1.3; margin: 6px 0 8px; }
.callout p { color: var(--muted); font-size: 14px; line-height: 1.65; max-width: 62ch; }
.callout__actions { display: flex; gap: 10px; flex-wrap: wrap; }
.callout--accent { background: color-mix(in oklch, var(--accent) 7%, var(--bg-card)); border-color: var(--accent-line); }
.contact-box { display: flex; align-items: center; justify-content: space-between; gap: 24px; flex-wrap: wrap; padding: 28px; background: var(--bg-card); border: 1px solid var(--border-faint); border-radius: 16px; }
.contact-box p { color: var(--muted); font-size: 14px; line-height: 1.65; max-width: 60ch; }

/* 相关阅读 */
.related-sec { border-top: 1px solid var(--border); padding: 40px 0; }
.related-sec .sec__head { margin-bottom: 18px; }
.related-card { display: flex; flex-direction: column; gap: 10px; padding: 20px; background: var(--bg-card); border: 1px solid var(--border-faint); border-radius: 14px; transition: background var(--dur-2) var(--ease), border-color var(--dur-2) var(--ease); }
.related-card:hover { background: var(--bg-elevated); border-color: var(--border-strong); }
.related-card p { flex: 1; color: var(--muted); font-size: 13px; line-height: 1.6; }
.related-card__more { display: inline-flex; align-items: center; gap: 5px; font-size: 12px; color: var(--fg-secondary); }
.related-card__more svg { color: var(--accent); }

/* 页头 */
.page-head { padding: 64px 0 40px; border-bottom: 1px solid var(--border); }
.page-head__grid { display: grid; grid-template-columns: minmax(0, 1fr) 340px; gap: 48px; align-items: start; }
.breadcrumb { display: flex; gap: 8px; align-items: center; font-size: 12.5px; color: var(--muted); margin-bottom: 22px; }
.breadcrumb a:hover { color: var(--fg); }
.page-title { font-family: var(--font-display); font-size: clamp(34px, 4.6vw, 52px); line-height: 1.32; letter-spacing: 0; font-weight: 600; margin-top: 10px; max-width: 26ch; text-wrap: balance; }
.page-head .lead { margin-top: 16px; max-width: 56ch; font-size: 18px; }

/* 正文 + 目录 */
.page-body { display: grid; grid-template-columns: minmax(0, 1fr) 220px; gap: 56px; padding: 48px 0 20px; }
.article { min-width: 0; }
.article .sec { padding: 40px 0; }
.article .sec:first-child { padding-top: 0; }
.toc { position: sticky; top: 92px; align-self: start; }
.toc__title { font-family: var(--font-mono); font-size: 10px; letter-spacing: .1em; text-transform: uppercase; color: var(--muted); margin-bottom: 10px; }
.toc a { display: block; padding: 6px 0 6px 12px; border-left: 1px solid var(--border); font-size: 12.5px; color: var(--muted); line-height: 1.5; }
.toc a:hover { color: var(--fg); border-left-color: var(--accent); }

/* 关于 */
.about-statement { font-family: var(--font-display); font-size: clamp(28px, 4vw, 44px); line-height: 1.35; letter-spacing: 0; font-weight: 500; max-width: 26ch; text-wrap: balance; }
.about-statement .brandline__word { letter-spacing: .08em; }
.terms { margin-top: 24px; }
.terms p { color: var(--muted); font-size: 14px; line-height: 1.7; margin-top: 6px; max-width: 40ch; }

/* CTA */
.cta-band { border-top: 1px solid var(--border); background: var(--bg-recessed); padding: 56px 0; }
.cta-band__inner { display: flex; justify-content: space-between; align-items: center; gap: 32px; flex-wrap: wrap; }
.cta-band h2 { font-family: var(--font-display); font-size: clamp(24px, 3vw, 34px); line-height: 1.35; margin-top: 8px; max-width: 26ch; text-wrap: balance; }
.cta-band .sec__intro { margin-bottom: 0; }
.cta-band__actions { display: flex; gap: 10px; flex-wrap: wrap; }

/* 语种字体：Latin 用 IBM Plex Sans，本语种 CJK 字形优先 */
html[lang="zh-Hant"] {
  --font-ui: "IBM Plex Sans", -apple-system, BlinkMacSystemFont, "PingFang TC", "Microsoft JhengHei", "Noto Sans TC", "Segoe UI", sans-serif;
  --font-display: "IBM Plex Sans", "PingFang TC", "Microsoft JhengHei", "Noto Sans TC", -apple-system, sans-serif;
}
html[lang="ja"] {
  --font-ui: "IBM Plex Sans", -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Hiragino Kaku Gothic ProN", "Yu Gothic", "Noto Sans JP", "PingFang SC", sans-serif;
  --font-display: "IBM Plex Sans", "Hiragino Sans", "Hiragino Kaku Gothic ProN", "Yu Gothic", "Noto Sans JP", -apple-system, sans-serif;
}
html[lang="ko"] {
  --font-ui: "IBM Plex Sans", -apple-system, BlinkMacSystemFont, "Apple SD Gothic Neo", "Malgun Gothic", "Noto Sans KR", "PingFang SC", sans-serif;
  --font-display: "IBM Plex Sans", "Apple SD Gothic Neo", "Malgun Gothic", "Noto Sans KR", -apple-system, sans-serif;
}

html[lang="en"] .hero h1, html[lang="es"] .hero h1 { font-size: clamp(32px, 3.4vw, 42px); line-height: 1.1; letter-spacing: -.02em; }
html[lang="ja"] .hero h1, html[lang="ko"] .hero h1 { font-size: clamp(34px, 4.2vw, 56px); line-height: 1.3; }
html[lang="en"] .page-title, html[lang="es"] .page-title { font-size: clamp(32px, 4.2vw, 48px); line-height: 1.1; letter-spacing: -.02em; }
html[lang="ja"] .page-title, html[lang="ko"] .page-title { font-size: clamp(34px, 4.6vw, 52px); line-height: 1.3; }
html[lang="en"] .about-statement, html[lang="es"] .about-statement { font-size: clamp(26px, 3.4vw, 38px); line-height: 1.15; letter-spacing: -.01em; }
html[lang="ja"] .about-statement, html[lang="ko"] .about-statement { font-size: clamp(26px, 3.6vw, 40px); line-height: 1.35; }
html[lang="en"] .hero .lead, html[lang="es"] .hero .lead { max-width: 52ch; }

/* 响应式 */
@media (max-width: 1280px) {
  .site-nav__links { display: none; }
  .mmenu { display: block; }
  .site-cta { display: none; }
  .site-nav { gap: 12px; }
  .site-actions { margin-left: auto; }
}
@media (max-width: 1100px) {
  .page-body { grid-template-columns: 1fr; gap: 0; }
  .toc { display: none; }
  .page-head__grid, .definition { grid-template-columns: 1fr; }
  .page-head__grid { gap: 32px; }
}
@media (max-width: 1240px) {
  .hero__grid { grid-template-columns: 1fr; gap: 40px; }
}
@media (max-width: 980px) {
  .grid-3, .grid-4 { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 760px) {
  .logo__domain { display: none; }
  .site-nav { height: 64px; }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
  .footer-brand { grid-column: 1 / -1; }
  .footer-lang { margin-left: 0; }
}
@media (max-width: 680px) {
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
  .hero { padding: 42px 0 36px; }
  .hero .lead { font-size: 17px; }
  .page-head { padding: 40px 0 28px; }
  .page-title { font-size: clamp(30px, 8vw, 40px); }
  .page-head .lead { font-size: 16.5px; }
  .sec { padding: 40px 0; }
  .sec h2 { font-size: 24px; }
  .cta-band { padding: 40px 0; }
  .callout { padding: 22px; }
  .footer-grid { grid-template-columns: 1fr; }
  .footer-brand { grid-column: auto; }
}
@media (max-width: 560px) {
  .site-nav { gap: 8px; }
  .logo__word { font-size: 18px; }
  .lang > summary { min-width: 58px; padding: 0 6px; }
  .steps li { flex-direction: column; gap: 8px; }
  .steps__n { min-width: 0; }
  .platform-row { gap: 12px; padding: 14px; }
  .status { font-size: 10px; }
  .footer-bottom { align-items: flex-start; }
}
@media (max-width: 420px) {
  .lang__short { display: none; }
  .lang > summary { min-width: 44px; }
  .mmenu__panel { width: calc(100vw - 24px); }
}

/* 下载页行动入口 */
.download-actions { display: flex; align-items: center; gap: 16px; flex-wrap: wrap; margin-top: 18px; }
.download-actions .caption { max-width: 60ch; }
.page-head { margin-bottom: 0; }